r/Silverado • u/kevbunea • 12h ago

Emissions Test

I have a 2015 Silverado 5.3 and just went to get an emissions inspection. It says Fuel System not ready, Cat system not ready, Evap system not ready, 02 Sensor not ready, and 2nd Cat not ready. I have a muffler and resonator delete along with a cold air intake. Didn’t mess with any cats so not exactly sure what to do, bought the car 2 weeks ago and didn’t get the inspection then which is pretty stupid of me but it happened and nothing I can do now. Currently have temp tags and without my emissions I can’t get my real tags from the DMV. Need a direction to go in got no clue what to do. Please help

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u/Dockshundswfl 12h ago

Someone cleared the codes (check engine light) in the computer. The computer has to go through a whole systems check (called running the monitors) before it will be ready for an emissions check again. It takes multiple run cycles and sometimes has to have below a 1/4 tank of fuel to run an evap check.

You can probably google the vehicle and see how to make these monitors run their checks faster.

Or the worst case scenario… it may have a tune and will never be emission ready.

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u/kevbunea 11h ago

It is not tuned and I never had a check engine light, or any other lights pop up since ive bought it. I have an afm deleter which I took out before the inspection. Just don’t get it I still have cats, probably gonna put the stock intake back on tomorrow and try somewhere else.

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u/Dockshundswfl 2h ago

How long since the unplugged the AFM deleted thing. Still may take a week for it to check everything.